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Two adjacent piano keys are struck simultaneously. The notes emitted by them hav frequencies nand n2. The number of beats heard per second is 

  • Option 1)

    \frac{1}{2}(n_{1} -n_{2})

  • Option 2)

    \frac{1}{2}(n_{1} +n_{2})

  • Option 3)

    n_{1} \sim n_{2}

  • Option 4)

    2(n_{1}-n_{2})

 

Answers (1)

best_answer

 

Beat Frequency -

\Delta \nu = \left | \nu _{1}-\nu _{2} \right |

module of \left ( \nu _{1} -\nu _{2}\right )

 

- wherein

Where \nu _{1} \: and\: \nu _{2} are frequency of two wave differ slightly  in value of frequency.

 

 


Option 1)

\frac{1}{2}(n_{1} -n_{2})

This is incorrect

Option 2)

\frac{1}{2}(n_{1} +n_{2})

This is incorrect

Option 3)

n_{1} \sim n_{2}

This is correct

Option 4)

2(n_{1}-n_{2})

This is incorrect

Posted by

Aadil

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